package com.example.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: ws
 * Date: 2024-02-06
 * Time: 20:55
 */

@Service
public class PaymentService {

    /**
     * 正常访问
     */
    public String paymentInfo_OK(Integer id) {
        return "线程池：" + Thread.currentThread().getName()
                + "\t paymentInfo_OK，id：" + id
                + "\t 正常访问";
    }


    // 服务降级
    // 超时访问，就去找兜底的方法
    @HystrixCommand(fallbackMethod = "paymentInfo_TimeoutHandler", commandProperties = {
            // 超过 3 秒就走上述的逻辑，即超时服务降级
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "3000")
    })
    public String paymentInfo_Timeout(Integer id) {
        try {
            TimeUnit.SECONDS.sleep(id);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        // 出现异常，也会兜底
//        int a = 1 / 0;// 算数异常
        return "线程池：" + Thread.currentThread().getName()
                + "\t paymentInfo_Timeout，id：" + id
                + "\t 耗时" + id + "秒后，正常访问";
    }


    public String paymentInfo_TimeoutHandler(Integer id) {
        return "线程池：" + Thread.currentThread().getName()
                + "\t paymentInfo_TimeoutHandler，id：" + id + "系统繁忙或运行出现错误，请稍后再试！";
    }


    // 服务熔断
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback", commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled", value = "true"),// 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"),// 请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"),// 时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "60"),// 失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id) {
        if (id < 0) {
            throw new RuntimeException("id 不能为负数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName() + "\t" + "调用成功，流水号：" + serialNumber;
    }


    public  String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id) {
        return "id 不能为负数，请稍后再试一试，id：" + id;
    }
}
